2 Copyright (C) 2002-2007 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "pbd/compose.h"
22 #include "canvas/canvas.h"
23 #include "canvas/debug.h"
25 #include "tempo_lines.h"
26 #include "public_editor.h"
27 #include "rgb_macros.h"
28 #include "ui_config.h"
32 TempoLines::TempoLines (ArdourCanvas::Container* group, double)
33 : lines (group, ArdourCanvas::LineSet::Vertical)
35 lines.set_extent (ArdourCanvas::COORD_MAX);
39 TempoLines::tempo_map_changed()
57 TempoLines::draw_ticks (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
59 framecnt_t leftmost_frame,
60 framecnt_t frame_rate)
62 const uint32_t base = UIConfiguration::instance().color_mod("measure line beat", "measure line beat");
64 for (unsigned l = 1; l < divisions; ++l) {
65 /* find the coarsest division level this tick falls on */
66 unsigned level = divisions;
67 for (unsigned d = divisions; d >= 4; d /= 2) {
68 if (l % (divisions / d) == 0) {
72 /* draw line with alpha corresponding to coarsest level */
73 const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
74 const uint32_t c = UINT_RGBA_CHANGE_A(base, a);
77 if (grid.begin()->c != 0.0) {
78 const double beat_divisions = (l / ((double) divisions)) * (grid.begin()->tempo.note_type() / grid.begin()->meter.note_divisor());
79 const double time_at_division = log (((grid.begin()->c * (beat_divisions)) /
80 grid.begin()->tempo.beats_per_minute()) + 1) / grid.begin()->c;
82 f = grid.begin()->frame + (framecnt_t) floor ((time_at_division * 60.0 * frame_rate) + 0.5);
84 const double fpb = grid.begin()->tempo.frames_per_beat (frame_rate)
85 * (grid.begin()->tempo.note_type() / grid.begin()->meter.note_divisor());
87 f = grid.begin()->frame + (l * (fpb / (double) divisions));
89 if (f > leftmost_frame) {
90 lines.add (PublicEditor::instance().sample_to_pixel_unrounded (f), 1.0, c);
96 TempoLines::draw (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
98 framecnt_t leftmost_frame,
99 framecnt_t frame_rate)
101 std::vector<ARDOUR::TempoMap::BBTPoint>::const_iterator i;
108 /* get the first bar spacing */
112 bars = (*i).bar - (*grid.begin()).bar;
113 beats = distance (grid.begin(), grid.end()) - bars;
115 beat_density = (beats * 10.0f) / lines.canvas()->width();
117 if (beat_density > 2.0f) {
118 /* if the lines are too close together, they become useless */
123 /* constrain divisions to a log2 factor to cap line density */
124 while (divisions > 3 && beat_density * divisions > 0.4) {
129 if (beat_density <= 0.12 && grid.begin() != grid.end() && grid.begin()->frame > 0) {
130 /* draw subdivisions of the beat before the first visible beat line XX this shouldn't happen now */
131 std::vector<ARDOUR::TempoMap::BBTPoint> vec;
133 draw_ticks (vec, divisions, leftmost_frame, frame_rate);
136 for (i = grid.begin(); i != grid.end(); ++i) {
139 color = UIConfiguration::instance().color ("measure line bar");
141 if (beat_density > 0.3) {
142 continue; /* only draw beat lines if the gaps between beats are large. */
144 color = UIConfiguration::instance().color_mod ("measure line beat", "measure line beat");
147 ArdourCanvas::Coord xpos = PublicEditor::instance().sample_to_pixel_unrounded ((*i).frame);
149 lines.add (xpos, 1.0, color);
151 if (beat_density <= 0.12) {
152 /* draw subdivisions of this beat */
153 std::vector<ARDOUR::TempoMap::BBTPoint> vec;
155 draw_ticks (vec, divisions, leftmost_frame, frame_rate);